What is Operating System (O.S.)? What are its functions
Answers
Operating System is an interface between the user and the hardware and enables the interaction of a computer’s hardware and software.
The functions of an operating system are as follows:-
1. DEVICE MANAGEMENT
2. PROCESS MANAGEMENT
3. FILE MANAGEMENT
4. MEMORY MANAGEMENT
5. STORAGE MANAGEMENT
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Answer:
An Operating System (OS) is an interface between a computer user and computer hardware. An operating system is a software which performs all the basic tasks like file management, memory management, process management, handling input and output, and controlling peripheral devices such as disk drives and printers.
Important functions of an operating System:
Security –
The operating system uses password protection to protect user data and similar other techniques. it also prevents unauthorized access to programs and user data.
Coordination between other software and users –
Operating systems also coordinate and assign interpreters, compilers, assemblers and other software to the various users of the computer systems.
Memory Management –
The operating system manages the Primary Memory or Main Memory. Main memory is made up of a large array of bytes or words where each byte or word is assigned a certain address. Main memory is fast storage and it can be accessed directly by the CPU. For a program to be executed, it should be first loaded in the main memory. An Operating System performs the following activities for memory management:
It keeps tracks of primary memory, i.e., which bytes of memory are used by which user program. The memory addresses that have already been allocated and the memory addresses of the memory that has not yet been used. In multiprogramming, the OS decides the order in which process is granted memory access, and for how long. It Allocates the memory to a process when the process requests it and deallocates the memory when the process has terminated or is performing an I/O operation.
Processor Management –
In a multiprogramming environment, the OS decides the order in which processes have access to the processor, and how much processing time each process has. This function of OS is called process scheduling. An Operating System performs the following activities for processor management.
Keeps tracks of the status of processes. The program which performs this task is known as a traffic controller. Allocates the CPU that is the processor to a process. De-allocates processor when a process is no more required.
Device Management –
An OS manages device communication via their respective drivers. It performs the following activities for device management. Keeps tracks of all devices connected to the system. designates a program responsible for every device known as the Input/Output controller. Decides which process gets access to a certain device and for how long. Allocates devices effectively and efficiently. Deallocates devices when they are no longer required.
Control over system performance –
Monitors overall system health to help improve performance. records the response time between service requests and system response to having a complete view of the system health. This can help improve performance by providing important information needed to troubleshoot problems.
Job accounting –
Operating system Keeps track of time and resources used by various tasks and users, this information can be used to track resource usage for a particular user or group of user.
Error detecting aids –
The operating system constantly monitors the system to detect errors and avoid the malfunctioning of a computer system.
File Management –
A file system is organized into directories for efficient or easy navigation and usage. These directories may contain other directories and other files. An Operating System carries out the following file management activities. It keeps track of where information is stored, user access settings and status of every file and more… These facilities are collectively known as the file system.
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